replacing bath tub with a shower stall

Hi everyone. I am looking to replace my bath tub with a fiberglass shower
stall. The one part of the project I am unsure about is a shower pan. I
know if I was going to tile my shower floor, wall, etc. that I need this.
Do I still need it with a fiberglass shower stall? After reading some
sites, I have seen the base for these stalls, but saw nothing about creating
a shower pan for a fiberglass shower stall?
If anyone has any links they are willing to share I would appreciate that as
well. Thanks.

On 8/23/2005 12:05 AM US(ET), Eric and Megan Swope took fingers to keys,
and typed the following:

As Rudy said, some shower stalls come with bases. I have a 4' shower
stall that is all one molded piece, base, side walls and back, and a one
piece 5' tub/shower enclosure. If you want to use the whole 5' space
where the tub is currently installed, see here for an example:
http://www.arpbathtubs.com/S6035R.htm , otherwise check the other types
out here: http://www.arpbathtubs.com/specs.html
When my shower stall and tub/shower enclosure were installed, they put a
bed of wet concrete in the spaces before setting the units in place,
thereby giving the fiberglass bases more support.

Thanks for the advice. I saw on the one site, instead of making a mortar
bed, the builder used 1/2 durock cement backer board to fill the gap between
the subfloor and the bottom of the shower base. He then used liquid nails
to adhere the base to the durock. Would this be acceptable as well?

On 8/23/2005 3:26 PM US(ET), Eric and Megan Swope took fingers to keys,
and typed the following:

The reason they use cement is that it will form to the base of the
shower. Usually, the shower base is not flat, but is dished so that the
water will run towards the drain. I don't think any backer board will
conform to the dish shape of the base.

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